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MarkH
Many years ago when I was on our board we had a similar problem; not wood fires, but odours from the exhaust vents from the building’s kitchen and bathroom extractor fans and sewage vent odours, as well as fumes from the old MAUs being sucked into the air intakes of the MAUs.
The solutions were (1) more powerful MAUs; although the old ones met the 1979 building code, in 2005 they were no longer acceptable. In addition, (2) the air intakes for the MAUs were raised about 3.0 m /10 ft above the rest of the rooftop, providing access to cleaner air.
Perhaps those solutions could work for you. An alternative might be to extend the chimneys to a greater height. I’m not an engineer so these are not technically appropriate suggestions; talk to a professional HVAC engineer.
